Rotary cutter.



T. H. PARKER.

ROTARY CUTTER.

APPLICATION FILED' OCT- 7 |916.

1,242,369. Patented oct. 9,1917.

THOMAS'H. PARKER, or sAN FRANCISCO, CALIFORNIA.

ROTARY CUTTER.

Application led October 7, 1916. Serial No.' 124,258.

To all whom it may concern:

Be it knownthat I, Trios/IAS. III. PARKER,

a citizen of the United States, residing. at`

San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Rotary Cutters, of which the following is a specification.

My invention relates to improvements in rotary cutters.

The object of my invention. is to provide a rotary cutter for use in woodworking having effective devices for the guardingof the hands of the operator from injury Ywhile the machine is in operation, though the operator is not exercising particular care to escape such injury.

My invention consists in the novel parts and arrangements of parts, shown in the accompanying drawing, described in the following specification and claimed in the appended claims.

In the drawing Figure 1 is a' transverseV sectional view of my rotary cutter showing a board to be planed, which is about to depress one of the guards, consisting of parts which swing out in the path of the cutters shown.

Fig. 2 is a similar view, showing a cutter in a different position, the guard being depressed, permitting the cutter to perform its work.

Fig. 3 is a plan view of Fig. 1.

In the figures, 1 is one of the rectangular cutters, to which cutting blades 2 are secured by means of screws 3. The frame of said cutter has cylindrical plates 4:, said plates carrying trunnions 5, which are preferably mounted in suitable bearings on the frame of the machine, not shown. V6 are rods mounted concentrically to the axis of the cutter and which are secured to the end plates 4 by means of the nuts 7. Pivotally mounted on said rods 6 are a plurality of plates 8 overbalanced on one side as shown at 14 so as to be able to swing out in the path ofthe cutting blades by the centrifugal action or forceof the rotary movement.

The force of this movement will overcome the pressure of the hand of the operator thereby preventing the lingers from coming in contact with the cutter. The outward movement of said guards is regulated byy Specification of Letters Patent. i Patnted 0013. 9, 1917.

i body as shown at v10. This limits the outer movementy of the portion 111.' lInterposedbetween each ofthe guards 8 are spacing washers 15. When a board 12 is moved along the .l

table 11 of the machine, not shown, and comes in contact with thev cutter that projects through va slot 13 in said table 11, the end of the board will come into'contact with thefguards and depress thesame asshown in Fig. 2, leaving the outer ones to protect the hands of the operator. Centrifugal forceis exerted on the said guards 8 when same are traveling in the direction of the arrows as shown, which force is availed of for the accomplishment of the'result. Any width of Vboard may be accommodated between'y the heads t as shown in Fig. 3.

'The guards are fso arranged 'that theyv come vin contact with the board after the supporting point has passed in the operation, and so that the force tending to defiect the guards is gradually applied. This is done to prevent chattering of the board due tothe too sudden application of the force.

rlhe normal position of the guard is such that it is above the arc described by the cutvol ting edge of the blade.V A board placed on i the table will deflect the guards in contact with it and allow the knife to operate at all other points the knife is protected by the guards. Therefore' any operator allowing his hand to come in contact with the head Y is protected from injury by the projecting guards. The guards are separated by wash? ers among other things to prevent gumming from sap in the lumber.

I claim:

1. A rotary cutter comprising a centrally mounted lrevoluble support; a knife on each end of said support, one of said knives pointing in a direction opposite to that .of the other of said knives, and an eccentrically mounted and outwardly curved guard on each side of said support, the curvature of said guard, being approximately the curve of the path of travel of one of said knives, and the point ofmounting of said guard havingv its eccentricity from its center within the area from said center to the end of said guard in proximity to the rear of the opposite knife.

2. A rotary cutter comprising a centrally mounted revoluble support; a knife ony each end of said support, one of said knives the other of Said knives, and an oooontlif the end of Said guard in proximity to @he 10 cally mounted and outwardly curved guard roar end of the opposite knife.

on each Side of said support havinga Shoul- Iii testimony i/'hevreof I affix my signature der engageable With said Support, the our- Vin presence of two Witnesses.

vature of Said guard being an ioximately Y the curve of the path of' timidi) of one of THOMAS H PARKER' said knives, and 'the point of mounting of .Vitnesses:

VSaid guaid having its ecoentrioity from its R.` B. TREAT, Y

Center Within the area from Said Center to RAE D. FISH.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

' Washington, D. C. 

